Investigators interviewed Krupa and his family and talked to employees at stores where the lucky tickets were purchased. They've found no evidence of cheating or other illegal activity, according to Kitts.

"It was just an unusual occurrence," Kitts told 9 News. "My best guess is this gentlemen and his family probably play quite a bit ... there's been an incredible streak of luck here as well."

Krupa says he has a "system" involving Internet searches for winning numbers that he then writes onto tickets by hand.

The jackpot wiz has at times been seen buying thousands of dollars worth of tickets in one week, store clerks told the station.